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A be the set of two positive integers an...

A be the set of two positive integers and `f: A -> Z^+` (set of positive integer) defined as `f(n)= p` where p is the largest prime factor of n. If the range of `f` is `{3}`, find A.

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Given range of function is {3}.
So `p=3` which states the highest prime factor of number in the set should be 3.
Now` 3,6,9` has the highest prime factors as` 3.`
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